Free SDF raymarcher for Godot 4 metaballs that blend colors, in one shader (CC0 + MIT)

Signed distance field raymarching in Godot 4, authored with nodes. Physics-driven metaballs melt into the SDF cubes in one fullscreen pass, and since every CSG op works on (color, distance) pairs, the colors blend along with the shapes.

Two free editions: Standalone shader (CC0): one .gdshader, no scripts paste onto a QuadMesh, edit map(). Godot Shaders https://godotshaders.com/shader/fullscreen-sdf-raymarching-with-smooth-csg-and-depth/

Node-based project (MIT): shapes as Node3D nodes, live editor preview, physics, up to 32 primitives and a write-up. VavLabs Mit
https://vav-labs.com/case-studies/sdf-raymarcher-godot/

Distance functions after Inigo Quilez.

youtube: https://youtu.be/Y1sd9Cx4NAs